Which of the following is/are true about the Cellular Membrane Structure: A. All membranes from plants, animals and microorganisms have similar biomolecular ultrastructure but varies in the types of lipids found. B. All membranes examined that have 2 dark-staining layers in the electron microscope indicated the presence of a layer exposed to the outer cell surface and another facing the cytiplasmic layer. C. The plasma membrane of cells are seen as thin, rigid, gel-like structure that is around 5-10nm thick. D. Some membranes have more protein components and some have similar percentage composition as the lipids. A, B, C only B, C, D only A, C, D only A, B, D only
Structure and Composition of Cell Membrane
Despite differences in structure and function, all living cells in multicellular organisms are surrounded by a cell membrane. Just like the outer layer of the skin separates the body from its environment similarly, the cell membrane, also known as 'plasma membrane,' separates the inner content from its exterior environment.
Cell Membrane
The cell membrane is known by different names like plasma membrane or cytoplasmic membrane, or biological membrane. The term "cell membrane" was first introduced by C. Nageli and C. Cramer in the year 1855. Later on, in 1931, the term "plasmalemma" for cell membrane was given by J. Plowe. The cell membrane separates the cell's internal environment from the extracellular space. This separation allows the protection of cells from their environment.
Prokaryotes vs Eukaryotes
The cell is defined as the basic structural and functional unit of life. The cell membrane bounds it. It is capable of independent existence.
Which of the following is/are true about the Cellular Membrane Structure:
A. All membranes from plants, animals and microorganisms have similar biomolecular ultrastructure but varies in the types of lipids found.
B. All membranes examined that have 2 dark-staining layers in the electron microscope indicated the presence of a layer exposed to the outer cell surface and another facing the cytiplasmic layer.
C. The plasma membrane of cells are seen as thin, rigid, gel-like structure that is around 5-10nm thick.
D. Some membranes have more protein components and some have similar percentage composition as the lipids.
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A, B, C only |
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B, C, D only |
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A, C, D only |
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A, B, D only |
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